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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Honestly I'd like to keep the PCB as simple as possible - it'd be Open Source so easy enough for anyone to get a new PCB spun with (for instance) LoRa on it if they wanted. This one would just be to get people started.
Adding a rechargeable battery solution is again really difficult - this thing will run for a year on a CR2032 - and probably at least 10 years on one of those non-rechargeable Lithium AA batteries - so I wonder how big a deal it really is.